Adapter for incandescent-lamp sockets.



Np. 810,473. PATENTED JAN. 23, 1906. s. E. DUANE.

ADAPTER FOR INOANDESGBNT LAMP SOCKETS. APPLICATION FILED MAR.27, i905.

- sockets and corresponding s1ve use, each socket requiring its own type ard lamp; The adapter shown herein is ar- ,new and useful Improvement in Adapters for threaded sleeve which receives and makes con- UNITED TES;

PATENT, OFFICE.

, SAMUEL EVERETT DOANE, or oLEvELAND, 01110, ASSIGNOR TO THE NATIONAL E ECTRIC LAMP co .CORPORATlON or NEW JERSEY.

MPANY, or CLEVELAND, OHIO, A

ADAPTER FOR- INCAND ESCENT-LAMP SOCKETS.

Specification of Letters Patent.

Patented Jam-23, 1906.

Application filed March 27', 1905. Serial No; 252,159.

Incandescent-Lamp Sockets, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings.

In the earlier years of incandescent lighting there were a number of different types of lamps in extenof lamp. In the endeavor to put the lamps on the market as cheaply as possible a standard type has been settled upon, known as the Edison type, comprising a base having a screw-threaded exterior which forms one terminal and a central contact on the end" of the base, which forms the other terminal. Many of the old sockets, however, remain in use, as of course expense is involved in substituting theEdison type of-socket therefor. Accordingly those who have the old sockets irequently prefer to pa the higher rice necessary to obtain the l amp adapts tofit the same.

The object of-this invention is to provide an adapter which may be fastened in one of the old sockets and become arigid part thereof and be able to receive the present standticularly designed tobe usedin a H. socket to receive the Edison lamp. Adapters from aT. H. socket to an Edison'lamp are in use, comprising usually a metallic screwtact with the metallic baseon the lamp, an insulating-diaphragm rigidly secured in the end ported by the diaphragm, the bushing being provided with internal'screw threads adaptedto pass over-and make contact with the projecting post withinthe T. H. socket. This adapter may be screwed into place by taking 'hol of the upper end of it with the fingers. It is easienhowever, to screw it first onto the lamp and use the bulb of the lamp as a handle to screw the lamp with the adapter into place. Whichever method of securing the adapter in the socket is employed, the adapter is very liable to be turned out with the lamp when itis removed for replacement by a new lamp, and it is thus very frequently lost. This invention provides an adapter which is so arranged thatit will remain in the socket when the lamp is screwed out. In accomplishing this I make the bushing, which carries the internal screw-threads, rotatable in the adaptersleeve, and I provide means for turning this bushing inde endently of the adapter-sleeve. This allows t e ada ter to be inserted in the socket and the bus 'ng turned around by a suitable'tool'tigntly onto the post, so that the adapter becomes a rigid part of the socket.

Referring to the drawings accompanying the specification, Figure 1 represents a long1- tudinal section of my adapter, the socket and lamp being indicated in dotted lines. Fig. 2

is an end view of the adapter as seenlfrom the bulb. Fig. '3 is an end view, partly broken away, as seen from the socket. Fig. 4 is a side elevation.

In Fig. 1, 2 represents the receiving-socket (Shown in dotted lines.) 3 is an ordinary inoandescentlamp. (Alsoshownindottedlines) 4-is the metallic sleeve of myadapter, which is designed to readily pass over and make contact with the usual metallic Edison base 11 of the lamp. The end of the sleeve is provided with a portion 9, which is designed to make contact with the terminal ring 10' ofthe socket-piece. The metallic sleeve is provided at the end with an insulatingdiaphragm 5, whichsupports the bushing 6. This bushing is desi ed to pass over the post projecting from t e socket-piece 2. The

diaphragm 5 must be loosely 'and'rotatably connected with either the bushing 6 orthe sleeve 4 in order to secure the purposes of my invention. Further, some means must be prov ded1n this instance shown as a slot in the bushing adapted to receive a-screw-.

driverby which one may firmly screw the bushing mto position on the post. The sleeve 4 is provided on its exterior with an insulating-case 8 to protect it from contact with the socket.

It will be seen that owing to the structure and arrangement of parts described it is possible to readily apply the adapter rigidly to the socket by screwing the bushing 6 'upon the socket-post-until'the end 9 is pressed firmly against the contact ring 10. When screwed into place, the bushing clamps the diaphragm 5, so that it cannot rotate, and the adapter is thus firmly held in the socket. The firmness of this holding is increased by securing the diaphragm rigidly to the sleeve, as shown in the drawings, and by roughening and eorrugating the bottom edge 9 of the adapter, as shown in Fig. 3.

In the form shown in the drawings the only tool necessary to apply the adapter is an ordinary screw-driver. By means of it my adapter is at once constituted a rigid part of the socketin ell'ect converting the old T. H. socket into an-Edison socket while Whenever it becomes desirable to re move the adapter it can easily be done with a screw-driver.-

Having described my invention, l. claim- 1. An adapter for incandescent lamps comprising a sleeve formed to engage a lamp-. base and contact members carried thereby to engage thev contacts o'l the socket, one of said members being rotatable independently of the other and'aecessible from within the sleeve and formed to'allow the application of means within the sleeve for rotating such member when the sleeve is in the socket. Y

2. An adapter for incandescent lamp sockets provided with a bushing adapted to fit over a post, and a sleeve adapted to reeeive the lamp-base, said sleeve and bushing being independently movable.

3. An adapter for incandescent lamp socketscomprising' a sleeve adapted to re-- ceive the lamp, a diaphragm within the end 3 5 of the sleeve, aninternally-threaded bushing 1 supported by the diaphragm, the bushing and the sleeve being relatively movable, said bushing being formed on its outer face to allow the application of means for rotating the bushing.

4. An adapter for incandescent lamp sockets comprising a sleeve adapted to receive the lamp and adapted to abut against a terminal ring within EtlillllP-SOCliQt, a diaphragm within the end of the sleeve and fix edly attached thereto, a bushing loosely supported by the diaphragm and adapted to be secured to a terminal post within the socket.

5. An adapter for incandescent lamp sockets comprising a sleeve adapted to receive the lamp, a diaphragm within the end of the sleeve, an internally-threade l bushing supported by the diaphragm and. rotatable and adapted to engage an externally-threaded terminal post within the .socket, said bushing having a screw-driver slot across its upper surface.

6. In an adapter for incainlescent damp.

sockets, an annularcontact portion provided with a roughened surface adapted to bite intothe metal of the terminal opposed thereto, and an independentlyrotatable center member constituting the other terminal of the adapter. I

In testimony whereof I hereunto allix my signature inthe presence of two witnesses SAMUEL EVERETT DUANE. Witnesses:

ALBERT H. BATES, C. E.'NIXON. 

